Improvement in screws for fastening stair-carpets



M. KlcKL.

Screwsfor Fastening Stair Carpets.

WMM

UNITED STATES PATENT GEEICE..

MORITZ KRICKL, 0F NEr YORK, N. Y.

IMPROVEMENT IN SCREWS FOR FASTENING STAlR-CARPETS.

Specilication forming part of Letters Patent No. 152,387, dated June 23,1874; application filed June 3 To all whom it may concern:

Be it known that I, MORITZ KRICKL, of the city, county, and State of NewYork, have invented certain new and useful Improvements in Screws forFastening Stair-Carpet, of which the following` is a specification:

This invention is illustrated in the accompanying drawing, in whichFigure l represents a longitudinal section. Fig. 2 is a face view.

Similar letters indicate corresponding` parts.

This invention consists in a screw, the shank of which is provided atone end with a wood screw-thread, while its other end is provided with ametal screwthread, and with a sharp point, the metal screw-thread beingintended to receive an ornamental head, which abuts against a shoulder,with 'a square in such a manner that this head, when it is applied tothe screw, offers a hold for a wrench, and the screw can be convenientlyinserted into the riser of a step; and when said head is removed thecarpet can be forced over the pointed end of the screw, where it will beretained by replacing the head.

If desired, a stair-rod may be placed between the carpet and the headsof the screws.

In the drawing, the letter A designates a screw, the shank of which isprovided at one end with a wood 'screw-thread, a, while its opposite endtorins a sharp point, b, and beneath this point is furnished with anietal screwthread, c. This metal serewthread is intended to receive andretain a head, B, which is by .preference made ornamental, and providedwith a square, d, to otter a good hold for a wrench. Then this head issecured on the metal screwthread c the screw A can be readily screwedinto the riser C of 'a step; and when two or more screws have beensecured in 'each riser of the stairs which are to be covered with acarpet the heads B of all said screws are removed, and the carpet isforced over the points b of the shanks, then the heads B are replaced,and the carpet is securely retained in position.

If desired, a stair-rod, D, may be placed between the carpet and theheads B on cach riser; but it will be readily seen that the carpet isretained solely by the shanks ot' the screws A.

These screws are of particu-lar advantage for fastening vstair-carpetswhich cover the entire surface ofthe stairs, and leave no space on theirsides for securing fastenings for stairrods ot' the ordinaryconstruction. l

In order to prevent the heads B from becoming fast on the metalscrew-threads c l have 'provided shoulders c at the inner ends of thesemetal screwthreads, so that the heads will abut against these shoulders,and after the screws have been secured in the risers the heads can bereadilv1 taken off.

When my screws are to be used in conjunction with stair-rods the heads Bare provided with stems j', which extend through sockets in thestair-rods.

That I claim as new, and desire to secure by Letters Patent, is-

An improved screw for fastening stair-carpets, provided at one -end witha wood screwthread, a, and at its opposite end with a shoulder, c, andsharp point d, and with a metal serewthread, c, and combined therewiththe head B, substantially in the nia-nner shown and described.

MORITZ Kinekn. n.. s]

Vituesses W. HAUEE, E. F. KAsTENnUBER.

